National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Severe Thunderstorms in the Midwest and Arizona; Heat Continues in the Southeast and Southwest

Thunderstorms, some severe, may lead to scattered instances of flash flooding across the Midwest and Ohio Valley and southern Arizona. The threat will shift to the Mid-Atlantic coast on Thursday. Dangerous heat persists in the South and Southeast while building into the Southwest. Overnight lows will be so warm that little-to-no relief from the scorching daytime highs will be available. Read More >

Current conditions at

Allentown, Lehigh Valley International Airport (KABE)

Lat: 40.65°NLon: 75.45°WElev: 384ft.

Fair

65°F

18°C

Humidity 93%
Wind Speed Calm
Barometer 29.97 in (1014.7 mb)
Dewpoint 63°F (17°C)
Visibility 10.00 mi
Last update 20 Aug 3:51 am EDT
Extended Forecast for

Allentown PA

  • Today

    Today: A chance of showers, then showers and thunderstorms after noon. High near 76. Calm wind becoming north around 5 mph in the afternoon. Chance of precipitation is 90%. New rainfall amounts between three quarters and one inch possible.

    High: 76 °F

    Chance
    Showers then
    T-storms

  • Tonight

    Tonight: Showers and thunderstorms likely, mainly before 8pm. Mostly cloudy, with a low around 61. Northeast wind around 5 mph becoming calm in the evening. Chance of precipitation is 60%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 61 °F

    T-storms
    Likely then
    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 80. Calm wind becoming northeast around 5 mph.

    High: 80 °F

    Mostly Sunny

  • Friday Night

    Friday Night: A slight chance of showers, then a chance of showers and thunderstorms after 2am. Increasing clouds, with a low around 64. Calm wind. Chance of precipitation is 50%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 64 °F

    Slight Chance
    Showers then
    Chance
    Showers

  • Saturday

    Saturday: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 8am. Mostly cloudy, with a high near 78. Calm wind becoming east around 5 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.

    High: 78 °F

    Showers
    Likely

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms before 8pm, then a chance of showers between 8pm and 2am. Mostly cloudy, with a low around 65. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 65 °F

    Chance
    T-storms then
    Chance
    Showers

  • Sunday

    Sunday: A chance of showers after 2pm. Partly sunny, with a high near 82. Chance of precipitation is 40%.

    High: 82 °F

    Partly Sunny
    then Chance
    Showers

  • Sunday Night

    Sunday Night: A chance of showers before 8pm. Partly cloudy, with a low around 61. Chance of precipitation is 30%.

    Low: 61 °F

    Chance
    Showers then
    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 78.

    High: 78 °F

    Sunny

Detailed Forecast

Today
A chance of showers, then showers and thunderstorms after noon. High near 76. Calm wind becoming north around 5 mph in the afternoon. Chance of precipitation is 90%. New rainfall amounts between three quarters and one inch possible.
Tonight
Showers and thunderstorms likely, mainly before 8pm. Mostly cloudy, with a low around 61. Northeast wind around 5 mph becoming calm in the evening. Chance of precipitation is 60%. New precipitation amounts between a quarter and half of an inch possible.
Friday
Mostly sunny, with a high near 80. Calm wind becoming northeast around 5 mph.
Friday Night
A slight chance of showers, then a chance of showers and thunderstorms after 2am. Increasing clouds, with a low around 64. Calm wind. Chance of precipitation is 50%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Saturday
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 8am. Mostly cloudy, with a high near 78. Calm wind becoming east around 5 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.
Saturday Night
A chance of showers and thunderstorms before 8pm, then a chance of showers between 8pm and 2am. Mostly cloudy, with a low around 65. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Sunday
A chance of showers after 2pm. Partly sunny, with a high near 82. Chance of precipitation is 40%.
Sunday Night
A chance of showers before 8pm. Partly cloudy, with a low around 61. Chance of precipitation is 30%.
Monday
Sunny, with a high near 78.
Monday Night
Mostly clear, with a low around 59.
Tuesday
Sunny, with a high near 79.
Tuesday Night
Mostly clear, with a low around 60.
Wednesday
A chance of showers. Mostly sunny, with a high near 82. Chance of precipitation is 30%.
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ABOUT THIS FORECAST

 
Point Forecast:
Allentown PA
 40.59°N 75.47°W (Elev. 299 ft)
Last Update:
4:08 am EDT Aug 20, 2026
Forecast Valid:
4am EDT Aug 20, 2026-6pm EDT Aug 26, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation